Brake-operating device.



v0. 'PFANDER. BRAKE OPERATING DEVICE.v APPLIOATION FILED MAB. 25, 1907.

l l f (5% @d Wvfm @y @www OTTO PFNDER, OF BRUSSELS, BELGIUM.

BRAKE-OPERATING nnvlon.

Specification of Letters Patent.

Patented May 4, 1909.

Application led March 25, 1907. Serial No. 364,336.

To all whom it may concern:

Be it known that l, OTTO PFNDER, a subvject of the` German Emperor,residing at Brussels, in the Kingdom of Belgium, ave invented certainnew and useful Improvements in Brake-Operating Devices, for Whichapplication has been made in France, August 3, 1906; Germany, August 6,1906; Great Britain, August 8, 1906, and Belgium, August 10, 1906.

This invention relates to improvements-in brake Ioperating devices andis especially adapted for use 'in connection with motor vehiclesalthough its utility is not confined 'to this type of machines.

The device of my invention is designed for use in connection with thatclass of devices which comprise generally a braking drum or like memberada ted to be acted upon by a plurality of disp aceable members and theobject of my invention is toprovide displacing means so constructed thatwhen operated to erform its function an equal displacing actlon Will beimparted to each of the disdetail vieW of a modified form of theinvenplaceable members and said means will not only serve to operateupon said members to equally distribute the Wear thereon but in casesaid members are unequally Worn the device of my invention Will serve toimpart an equal amount of displacing action to each of said membersthereby resulting not only in a more eflicient braking action but in afinal equalization lof said members, in point of Wear, as a result ofthe equal pressure imparted. i

The invention will be more fully described -in connection with theaccompanying drawing and Will be more particularly pointed outandascertained in and by the appended claims.

In the drawingz-Figure 1 is a fragmentary view partly in elevation andpartly in section of a device embodying the main features of myinvention. Fig. 2 is a sectional vieW on line 2-2 of Fig. 1. Fig. 3 is ation.

Like numerals of reference designate similar parts throughout thedifferent figures of A. suitable support for the brake operating meansis indicated by 9 and may bc of any desired construction and as shown isprovided with a sleeve 14 carrying a. brake shaft 13. An operating lever1() is rigidly secured to said shaft 13 and is connected withyieldin'gly acting means, preferably in. the form of a spring 12 wherebyit is held in a normal position, said spring 12 being connected at itsother end at 15 to a suitable stationary part such for instance-as anextension 16 on thc support 9. A braking member which as shown is in theform of a drum 5 may be connected in any desirable manner with thedriving elements of the vehicle but as such connection forms no, part ofthe present invention and asitmay be formed in any desirable manner thesame is not herein shown, Displacing members` 4 and 17 are herein showndisposed in a manner to operate in connection With the drum 5 preferablyby engagement with the inner surface thereof. Means are desirablyemployed for normally maintaining said members out of engagement withthe drum 5 and as shown said means consists of a spring 11 connected byits rotation in such a manner that positive rotative movement isimparted to the cam but the same is allowed a limited amount-of-movement With respect to said devic-eand as 'shown said cam may beafforded positive engagement with said device in the performance of itsfunction after such limited movement has been taken up. In the mostpreferred embodiment of the invention there is interposed between saiddevice and the cam yieldingly acting elements the function of which isto impart a gradual braking action to said displaceable members.

Referring noW to the specific construction shown the shaft 13 isprovided With an end portion 7 of polygonal cross-section operativelyassociated witli a cam 2. Preferably said cam 2 is provided With anopening 20 through which the portion 7 prrgects and said opening 20. isadapted to t closely a'gainst two sides of the portion 7 to provide forpositive engagement with the cam and is somewhat larger than the endportion 7 at opposite points indicated yby 21 to permit relativemovement of the camv with respect to said end portion y 7. In theembodiment shown those parts of the cam and the end portion 7 `adaptedfor positive engagement with each other are forthe purposes of rotatingthe cam 2. Springs 8 are interposed between the opposite sides ofsaidend portion 7 in the spaces21 of the cam 2 forengagement with thecam to normally hold the latterin the position shown with respect tosaid portion 7. Said cam 2 is provided with operating cam surfaces 22adapted for engagement with the ends of the members 4 and 17.

Whenv power is applied to the outer end of lever 10, by an;T suitablemeans not. herein shown, and said lever is swung against the actionofsprin'g 12 in .the direction of the arrow, rotary movement is impartedto they member 7 through shaft 13, and said member 7 positively engagesthe cam 2 to rotate the same and bring the operating or c am surfaces22. int-o engagement with the members 4 and 17 whereby the latter aredisplaced andforced into engagement with the drum f 5. If there` is anyinequality or difference between the'vmembers 4 and 17 as the result ofwear or imperfection inthe metal the cam 2 after or before effectingenga ement be-` tween said members 4 'and 17 Wit the drum 5 will bedisplaced with respect to the -portion 7 in a manner to exert an equal'pressure on each of said members 4 and V17. Assuming thatl the member 4has become Worn to a greater 'extent than the member 17 it willbeobvious'that a more extended movement tion of the cam `would result indisplacing it 1 toward the member 4 by reason ofits engagement with themember 17 until said memequalizes pressure exerted on said members butshould one of said members wear more rapidly than the'other said 'camwould tend' to restore said members to an equal size. It will be obviousfrom the foregoing that While the springs 8 are desirable-and affordmany advantages by reason of the fact that they maintain the cam 2 in anormal position with respect to the portion l7 tstill said springs arenot essential to the full realization of the invention as the devicethereof would operate`vr effectively without said springs. y

In Fig. 3 there is shown a modified form ofthe invention wherein thereis illustrated leaf springs 23 which engage the part 7 in lace of thespiral springs shown in the pre.-

erred form.

I claim:-

`-.` 1. In combination, a ibrakingcmember,A

displaceable members ada tedto'` cooperate therewith, a c'arn for dispacing said members to effect engagement thereof with said braking memberand providedwith an elongated slot, and a shaft engaging the walls ofsaid slot to `positively rotate said cam, said slotpermittin movementlof said cam with respect to sai shaft.-

2. In combination, a braking member, displaceable members adapted t,cooperate therewith, a cam for displacing saidy members' to effectengagement thereof with said braking member and provided with an elon'-gated slot, a shaft engaging the walls of said slot to positively rotatesaid-cam, .said slot permittmgmovement of said cam with re- -spect -tosaid shaft, and springs interposed between said shaft and cam.

In testimony whereof I aflix my signature in presence of two Witnesses.

OTTO PFANDER. Witnesses: g

L. LARETTE,

GREGORY PHELAN,

